of using, you know, his... you know, using him to try to bring me down, i think that that is inappropriate. >> pelley: well, sit down and talk to me about it. legal experts tell us that both stowe and morales have broken u.s. law, committed fraud, by making a false claim. it doesn't matter that the procedure is done in another country. we wondered why the f.d.a. is not acting against the many stem cell con artists whose web sites are up for anyone to see. but the f.d.a. commissioner, margaret hamburg, declined to talk with us on camera about any aspect of stem cell quackery. many experts believe that the f.d.a. is outmatched. >> larry goldstein: patients need to beware. >> pelley: larry goldstein, a prominent stem cell biologist, and researcher doug sipp, are with the international society for stem cell research, an organization of the world's leading stem cell scientists. sipp is tracking bogus stem cell clinics all around the world. how have these operations grown, say, in the last five years or so? >> doug s